How to make asp.net core rc2 (.net framework) work with EF 7 and .net 4.61

asp.net-core entity-framework-core

Question

I have created an asp.net core RC2 (.NET 4.61 framework) project.

Then I have created another "DataProvider" nuget class library (.NET core) with Entity Framework references and changed the framework in the project.json settings to "net461":{}.

The reason why I did not create a common c# class library because it has no project.json but I need that to setup stuff like:

{
  "version": "1.0.0-*",

  "dependencies": {
    "Microsoft.EntityFrameworkCore": "1.0.0-rc2-final",
    "Microsoft.EntityFrameworkCore.Tools": {
      "type": "build",
      "version": "1.0.0-preview1-final"
    }
  },
  "tools": {
    "Microsoft.EntityFrameworkCore.Tools": {
      "imports": [ "portable-net451+win8" ],
      "version": "1.0.0-preview1-final"
    }
  },
  "frameworks": {
    "net461": {
      "buildOptions": {
        "emitEntryPoint": true
      }
    }
  }
} 

The DataProvider project has my DbContext class.

Thus I go to the command line to the DataProvider directory and execute:

dotnet ef migrations add Init

Then I get this error:

This preview of Entity Framework tools does not support targeting class library projects in ASP.NET Core and .NET Core applications. See http://go.microsoft.com/fwlink/?LinkId=798221 for details and workarounds.

I do NOT want to put my DbContext into the asp.net core rc2 project !!!

I clicked that link to find more about that workarounds, but there is actually nothing helpfull until I found that link:

https://github.com/aspnet/EntityFramework.Docs/blob/master/docs/cli/dotnet.rst

Here are 2 workarounds introduced due to this error I had before:

workaround 1 did not work ("To make the project a .NET Core App, add the "netcoreapp1.0" framework to project.json along with the other settings in the sample below:")

This is how I changed then the project.json

{
  "frameworks": {
    "netcoreapp1.0": {
      "imports": [ "portable-net451+win8" ],
      "buildOptions": {
        "emitEntryPoint": true
      },

      "dependencies": {
        "Microsoft.NETCore.App": {
          "type": "platform",
          "version": "1.0.0-*"
        },
        "Microsoft.EntityFrameworkCore": "1.0.0-rc2-final",
        "Microsoft.EntityFrameworkCore.Tools": {
          "type": "build",
          "version": "1.0.0-preview1-final"
        }
      },
      "tools": {
        "Microsoft.EntityFrameworkCore.Tools": {
          "imports": [ "portable-net451+win8" ],
          "version": "1.0.0-preview1-final"
        }
      }
    }
  }
}

=> Because after many nugets get installed and I rebuild then I also have to add a program.cs which I added etc.. Then I rerun the "dotnet ef migrations add Init" on the CMD getting this error: No executable found matching command "dotnet-ef"

workaround 2 did not work: ("To make a desktop .NET app, ensure you project targets "net451" or newer (example "net461" also works) and ensure the build option "emitEntryPoint" is set to true.")

=> Because I get compile exception, that program.cs has no Main method.

Ok, I have a class library this has never a program.cs ... Then I added the program.cs with the static Main method. Now the project compiles, but when I rerun the "dotnet ef migrations add Init" on the CMD I get the same error as before !!!

What should I do to make the execution of "dotnet ef migrations add Init" work?

1
3
5/27/2016 9:34:05 PM

Popular Answer

The CMD error that you're seeing is a bug (See #4797, #1858, #4555, #5392).

I managed to overcome this error during my migration to RC2 by restarting my computer (Fancy, I know). It seems to be fixed in the internal feed though, there's also a PR in #1858.

2
5/28/2016 12:32:08 PM


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